Add support/workaround for using AutoLogOutput with Kotlin singletons

[amsam0]

If you store your RobotContainer and subsystems as Kotlin objects (singletons), AutoLogOutputManager will not pick up on them because they are not stored as fields.

Seeing as though finding all Kotlin objects using reflection is not feasible, it would be great to be able to call the registerFields method of AutoLogOutputManager manually to avoid storing objects as fields.

For now, we can do it via reflection:

fun registerFieldsForAutoLogOutput(root: Any) {
    val method = AutoLogOutputManager::class.java.getDeclaredMethod("registerFields", Object::class.java)
    method.isAccessible = true
    method.invoke(null, root)
}

// ... in robotInit ...
registerFieldsForAutoLogOutput(RobotContainer)

// ... in RobotContainer ...
registerFieldsForAutoLogOutput(Drive)